144 lines
3.6 KiB
C
144 lines
3.6 KiB
C
/* bnx2i_sysfs.c: Broadcom NetXtreme II iSCSI driver.
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*
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* Copyright (c) 2004 - 2012 Broadcom Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation.
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*
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* Written by: Anil Veerabhadrappa (anilgv@broadcom.com)
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* Maintained by: Eddie Wai (eddie.wai@broadcom.com)
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*/
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#include "bnx2i.h"
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/**
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* bnx2i_dev_to_hba - maps dev pointer to adapter struct
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* @dev: device pointer
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*
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* Map device to hba structure
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*/
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static inline struct bnx2i_hba *bnx2i_dev_to_hba(struct device *dev)
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{
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struct Scsi_Host *shost = class_to_shost(dev);
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return iscsi_host_priv(shost);
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}
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/**
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* bnx2i_show_sq_info - return(s currently configured send queue (SQ) size
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* @dev: device pointer
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* @buf: buffer to return current SQ size parameter
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*
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* Returns current SQ size parameter, this paramater determines the number
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* outstanding iSCSI commands supported on a connection
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*/
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static ssize_t bnx2i_show_sq_info(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
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return sprintf(buf, "0x%x\n", hba->max_sqes);
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}
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/**
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* bnx2i_set_sq_info - update send queue (SQ) size parameter
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* @dev: device pointer
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* @buf: buffer to return current SQ size parameter
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* @count: parameter buffer size
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*
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* Interface for user to change shared queue size allocated for each conn
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* Must be within SQ limits and a power of 2. For the latter this is needed
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* because of how libiscsi preallocates tasks.
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*/
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static ssize_t bnx2i_set_sq_info(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
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u32 val;
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int max_sq_size;
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if (hba->ofld_conns_active)
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goto skip_config;
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if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type))
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max_sq_size = BNX2I_5770X_SQ_WQES_MAX;
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else
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max_sq_size = BNX2I_570X_SQ_WQES_MAX;
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if (sscanf(buf, " 0x%x ", &val) > 0) {
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if ((val >= BNX2I_SQ_WQES_MIN) && (val <= max_sq_size) &&
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(is_power_of_2(val)))
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hba->max_sqes = val;
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}
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return count;
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skip_config:
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printk(KERN_ERR "bnx2i: device busy, cannot change SQ size\n");
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return 0;
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}
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/**
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* bnx2i_show_ccell_info - returns command cell (HQ) size
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* @dev: device pointer
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* @buf: buffer to return current SQ size parameter
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*
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* returns per-connection TCP history queue size parameter
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*/
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static ssize_t bnx2i_show_ccell_info(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
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return sprintf(buf, "0x%x\n", hba->num_ccell);
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}
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/**
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* bnx2i_get_link_state - set command cell (HQ) size
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* @dev: device pointer
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* @buf: buffer to return current SQ size parameter
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* @count: parameter buffer size
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*
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* updates per-connection TCP history queue size parameter
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*/
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static ssize_t bnx2i_set_ccell_info(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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u32 val;
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struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
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if (hba->ofld_conns_active)
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goto skip_config;
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if (sscanf(buf, " 0x%x ", &val) > 0) {
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if ((val >= BNX2I_CCELLS_MIN) &&
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(val <= BNX2I_CCELLS_MAX)) {
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hba->num_ccell = val;
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}
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}
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return count;
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skip_config:
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printk(KERN_ERR "bnx2i: device busy, cannot change CCELL size\n");
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return 0;
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}
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static DEVICE_ATTR(sq_size, S_IRUGO | S_IWUSR,
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bnx2i_show_sq_info, bnx2i_set_sq_info);
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static DEVICE_ATTR(num_ccell, S_IRUGO | S_IWUSR,
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bnx2i_show_ccell_info, bnx2i_set_ccell_info);
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struct device_attribute *bnx2i_dev_attributes[] = {
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&dev_attr_sq_size,
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&dev_attr_num_ccell,
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NULL
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};
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